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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
for the guidance of teachers
0610 BIOLOGY
0610/52
Paper 5 (Practical Test), maximum raw mark 40
Mark schemes must be read in conjunction with the question papers and the report on the
examination.
•
CIE will not enter into discussions or correspondence in connection with these mark schemes.
CIE is publishing the mark schemes for the October/November 2010 question papers for most IGCSE,
GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level
syllabuses.
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MARK SCHEME for the October/November 2010 question paper
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er
International General Certificate of Secondary Education
Page 2
Question
1
Mark scheme
(a) (i)
appearance
texture
(ii)
(b) (i)
(ii)
Syllabus
0610
Paper
52
Additional guidance A. = accept, R. = reject, I. = ignore.
W1
– 3 weeks
wrinkled skin
/ smaller than
the other two
apples / more
coloured /
AW
softest / AW
W2
– 1 week
few wrinkles
/ larger /
less
coloured /
AW
W3
– fresh
no wrinkles /
largest of the
apples / more
green / AW
slightly soft /
AW
firm / AW
Check Supervisor’s report for details of apples provided.
[1] appearance in each box;
[2] texture in each box;
[3] difference in each row;
[3]
W1 wrinkled skin / smaller / more coloured / softest in
texture;
… test / dip into iodine solution;
expected colour change;
reducing sugar
… make solution / extract of sample;
add Benedict’s solution;
heat;
expected colour change;
ONE safety feature;
Check Supervisor’s report.
[1]
starch
test
starch
reducing
sugar
(iii)
Mark Scheme: Teachers’ version
IGCSE – October/November 2010
W1
– 3 weeks / older
brown;
orange / red;
W2
– 1 week
some black
areas;
orange;
Max 3 for reducing sugars.
A. water-bath / lab. coat / tongs / etc. I. gloves
[max 4]
Check Supervisor’s report.
Observations in (b)(ii)
W3
– fresh
more black
areas;
yellow;
[5]
deduction for starch;
deduction for reducing sugar;
comparison with storage time as fruit ripens / no difference;
All boxes completed = 5
Wrong colour or blank box –1.
Deductions in (b)(iii) based on candidate’s observations.
[3]
© UCLES 2010
Page 3
Question
Mark Scheme: Teachers’ version
IGCSE – October/November 2010
Mark scheme
(c) (i)
time / days
mass of apples –
not wrapped / g
All correct = 1.
Error carried forward for plot.
loss in mass / g
[1]
y-axis – loss in mass / g and x-axis – time / days
To fill more than ½ the grid.
A – axes orientation and labels + units;
S – scale – suitable to fill more than half the grid and even;
P – plot;
L – line;
[4]
(iii)
(iv)
respiration / oxidation / fermentation / evaporation /
transpiration / water loss / decay / decomposition;
1.
2.
3.
4.
5.
6.
Paper
52
Additional guidance A. = accept, R. = reject, I. = ignore.
0
10.1
35.5
66.3
93.5
109.5
(ii)
Syllabus
0610
Allow +/– 0.5 mm square
No extrapolation. A. Ruled lines A. lines of best fit.
Or smooth curve.
Histogram / bar chart
A, P and neat ruled columns which do not touch – Max 3
I. hydrolysis / osmosis / eating.
[1]
keep in cooler conditions;
cover apples;
keep dry / well ventilated;
under different gases / nitrogen / carbon dioxide / less
oxygen / air tight / vacuum;
keep separated / in smooth containers;
not in sunlight / shade;
A. keep in a refrigerator.
[max 3]
[Total: 25]
© UCLES 2010
Page 4
Mark Scheme: Teachers’ version
IGCSE – October/November 2010
Syllabus
0610
Paper
52
Question
Mark scheme
Additional guidance A. = accept, R. = reject, I. = ignore.
2
Drawing: O clear outline, no heavy shading
P larger size;
D two valves;
Label:
hinge / shell / exoskeleton / ligament;
Oyster, freshwater mussel, mussel, clam etc.
(a)
(b)
Protective / camouflage;
hard / tough / rigid;
from predators / being eaten / prevent drying out / pressure
or waves or depth of water;
(c) (i)
(ii)
(d)
[4]
mollusc;
I. thick wall / coat / testa.
[max 2]
[1]
Accept reasonable spelling
Check if within range
length in Fig. 2.1 – 38 to 41 mm;
scale line is 25 mm = 0.5 cm – 1/5th or ÷ 5;
actual size;
[3]
A. in range 7.4 to 8.2 mm
Independent marking.
animal tube:
colour
– yellow – (acidic);
explanation – CO2 / high CO2 / carbonic acid;
from respiration;
waterweed tube:
colour
– purple – (alkaline);
explanation – low CO2 / CO2 used up / taken in / AW;
by photosynthesis;
[max 5]
[Total: 15]
© UCLES 2010
Some Centres used universal indicator.
Acid – red
Alkaline – blue / purple.
2 marks for colour in each
3 marks for explanation.